Am 29.05.2012 19:50, schrieb Mark Nelson:
I did some quick tests on a couple of nodes I had laying around this
morning.
I just noticed that i get a constant rate of 40MB/s while using 1
thread. When i use two thread or more i get drop to 0MB/s and crazy
jumping values.
~# rados -p rbd bench 90 write -t 1
Maintaining 1 concurrent writes of 4194304 bytes for at least 90 seconds.
sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
0 0 0 0 0 0 - 0
1 1 10 9 35.994 36 0.100147 0.101133
2 1 20 19 37.9931 40 0.096893 0.100719
3 1 31 30 39.9921 44 0.09784 0.0999607
4 1 41 40 39.9929 40 0.099156 0.0999003
5 1 51 50 39.9932 40 0.098239 0.0996518
6 1 61 60 39.9932 40 0.098682 0.0994851
7 1 71 70 39.9933 40 0.094397 0.099184
8 1 81 80 39.9931 40 0.099823 0.0993327
9 1 91 90 39.9931 40 0.101013 0.0992236
10 1 101 100 39.993 40 0.098277 0.099237
# rados -p rbd bench 90 write -t 2
Maintaining 2 concurrent writes of 4194304 bytes for at least 90 seconds.
sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
0 0 0 0 0 0 - 0
1 2 15 13 51.9888 52 0.0956 0.115315
2 2 22 20 39.9928 28 0.120065 0.193125
3 2 41 39 51.9917 76 0.09557 0.15246
4 2 58 56 55.9912 68 0.09875 0.137688
5 2 67 65 51.992 36 0.111211 0.139465
6 2 85 83 55.3251 72 0.136967 0.143079
7 2 101 99 56.5625 64 0.098664 0.136263
8 2 101 99 49.4919 0 - 0.136263
9 2 112 110 48.8808 22 0.099479 0.160563
Stefan
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